If your numpad is not activated (Num Lock pressed - there should be a LED above the numpad that turns ON) key 2 is in fact down arrow and 8 is up arrow, that's the controls for volume down and up. So, please press the numlock key on your keyboard and afterwards press 5 on the num keyboard and after, shift+2 (hold shift pressed and while it's pressed, also press 2, either on numpad, either the keys above the letters.
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